In a contract between purchaser and vendor , a vendor has received 2,00,000/- by executing a sale agreement and after that the purchaser came to know that the vendor has obtained a loan over the property from his department .He is a central govt employee.NOW HE IS DODGING THE PURCHASER without executing the contract though purchaser is willing to perform the contract and the purchaser wants to send notice before the expiry of the date of contract. can he do so?